/*===========================================================================*\
*                                                                           *
*                               OpenMesh                                    *
*      Copyright (C) 2001-2005 by Computer Graphics Group, RWTH Aachen      *
*                           www.openmesh.org                                *
*                                                                           *
*---------------------------------------------------------------------------* 
*                                                                           *
*                                License                                    *
*                                                                           *
*  This library is free software; you can redistribute it and/or modify it  *
*  under the terms of the GNU Library General Public License as published   *
*  by the Free Software Foundation, version 2.                              *
*                                                                           *
*  This library is distributed in the hope that it will be useful, but      *
*  WITHOUT ANY WARRANTY; without even the implied warranty of               *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU        *
*  Library General Public License for more details.                         *
*                                                                           *
*  You should have received a copy of the GNU Library General Public        *
*  License along with this library; if not, write to the Free Software      *
*  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
*                                                                           *
\*===========================================================================*/

//=============================================================================
//
//  CLASS newClass
//
//=============================================================================

#ifndef OPENMESH_VDPROGMESH_VFRONT_HH
#define OPENMESH_VDPROGMESH_VFRONT_HH


//== INCLUDES =================================================================

#include <Core/System/config.hh>
#include <Tools/VDPM/VHierarchyNode.hh>
#include <vector>


//== FORWARDDECLARATIONS ======================================================


//== NAMESPACES ===============================================================

namespace OpenMesh {
	namespace VDPM {

		//== CLASS DEFINITION =========================================================


		/** Active nodes in vertex hierarchy.
		\todo VFront documentation
		*/
		class VFront
		{
		private:

			typedef VHierarchyNodeHandleList::iterator  VHierarchyNodeHandleListIter;
			enum VHierarchyNodeStatus { kSplit, kActive, kCollapse };

			VHierarchyNodeHandleList                    front_;
			VHierarchyNodeHandleListIter                front_it_;
			std::vector<VHierarchyNodeHandleListIter>   front_location_;

		public:

			VFront();

			void clear() { front_.clear(); front_location_.clear(); }
			void begin() { front_it_ = front_.begin(); }
			bool end()   { return (front_it_ == front_.end()) ? true : false; }
			void next()  { ++front_it_; }
			int size()   { return (int) front_.size(); }
			VHierarchyNodeHandle node_handle()    { return  *front_it_; }

			void add(VHierarchyNodeHandle _node_handle);
			void remove(VHierarchyNodeHandle _node_handle);
			bool is_active(VHierarchyNodeHandle _node_handle);
			void init(VHierarchyNodeHandleContainer &_roots, unsigned int _n_details);  
		};


		//=============================================================================
	} // namespace VDPM
} // namespace OpenMesh
//=============================================================================
#endif // OPENMESH_VDPROGMESH_VFRONT_HH defined
//=============================================================================
